Location-based services are popping up everywhere to provide marketing and advertising services, from Foursquare to Gowalla to Loopt. Then there's Brightkite, Yelp, Whrrl, Where.com, Zintin, and more.
Mark Thompson gives us the rundown on some of the most popular services, along with screen shots to help visualize offerings, resources and tools.
Read the whole story at Search Engine Journal »
